No contact number for online store www.onedayonly.co.za

I ordered a gas heater from www.onedayonly.co.za and received an incorrect product. I tried searching for a contact number to speak to a person to make the exchange, however I notice that www.onedayonly.co.za does not provide a contact for customers after care, the only option is to use their website or chat to robot on whatsapp. This is highly *********, practice and unfriendly to consumers. This is also non-compliant with the Consumer Protection Act, that requires admissible contact details like a phone number to be made available to the public. Further to that the customer service response over whatsapp and on the website was tiresome. Not acceptable, thus I am warning my fellow consumers to be aware of purchasing items on this e-commerce/ online store as returns and exchanging faulty products can be a nightmare.